An Australian couple plan to marry on Thursday (local time) while they line up in Los Angeles for the first US public showings of Star Wars: The Force Awakens, while movie theatres around the country held marathons of the previous films in the franchise.

Key points:

Caroline Ritter and Andrew Porters have been camped outside Hollywood's Chinese Theatre since December 5

Ms Ritter will walk down the aisle with another fan dressed as Darth Vader

In Texas, dozens of fans lined up to watch a 16-hour marathon of the first six Star Wars movies

Truck driver Caroline Ritter, 34 and firefighter Andrew Porters, 29, are among about 100 fans who have been camped outside Hollywood's Chinese Theatre since December 5 for the opening of The Force Awakens.

Ms Ritter is to be walked down the aisle by another fan, dressed as Darth Vader, and the couple plan to celebrate by seeing the movie afterward.

"The extraordinary ticketing demand is truly unprecedented," said Fandango President Paul Yanover.

"It is Fandango's top-selling movie of all time, even before it has even hit theatre screen."

But movie studio Walt Disney Co said millions of tickets are still available this weekend as theatres add capacity to meet demand.

Star Wars is like going to church: Fan

In San Antonio, Texas, several dozen die-hard fans stood in line at dawn on Thursday to watch a 16-hour marathon of the first six movies in the Star Wars franchise to set the mood for seeing The Force Awakens later in the day.

"I think I was like, two, when I first saw A New Hope, which is Episode Four, and I just fell in love with the movies," said Matt Kelly, who recalls his father playing the early Star Wars films for him on videocassette in the 1990s.

Matt Shavers, who was among the San Antonio fans, compared Star Wars to going to church.

"Part of it is like the mythology of it, the religious aspect of it. The storytelling is so amazing," he said.

"It's gorgeous. It's the greatest saga ever written."

Although The Force Awakens has several strong female characters and marketing for the movie has been directed at women more than ever, some 68 per cent of those buying tickets in advance are male and the majority are people over the age of 30, according to data from Movietickets.com.

Star Wars: The Force Awakens is expected to take some $200 million at the North American box office over its opening weekend, according to box office analysts, making it one of the biggest openings of all time.

OK Fox Sports, it's great that you got $30 million from the Federal Government to broadcast more women's and community sport. But, asks Mary Gearin, when are you actually going to tell us what you're spending it on?